PART II: MODEL 



Model Design 



9. Model tests were conducted at a geometrically undistorted linear 

 scale of 1:35, model to prototype. Scale was selected based on the absolute 

 size of the model breakwater necessary to ensure the preclusion of stability 

 scale effects (Hudson 1975) and the capabilities of the available wave 

 generator to produce required wave heights at modeled water depths. Time 

 relations were scaled according to Froude Model Law (Stevens et al. 1942). 

 The following model -prototype relations were defined in terms of length L 

 and time T : 



Scale Relations 



Characteristic 



Dimension 



Model : Prototype 



Length 



L 



L r = 1:35 



Area 



L 2 



A r = 1:1,225 



Volume 



L 3 



V r = 1:42,875 



Time 



T 



T r = 1:5.92 



where the subscript r denotes the ratio of model to prototype. 



10. The specific weight of water used in the model was assumed to be 

 62.4 pcf, and that of the prototype (seawater) was 64.0 pcf. The specific 

 weights of model breakwater construction materials were assumed to be identi- 

 cal to the prototype, which was reported to be 165 pcf. The model and proto- 

 type variables were related by the transference equation of Hudson (1975) : 



; s a) - 1 



- 1 



(1) 



where 



W a * = weight of an individual armor unit, lb 

 i, p = model and prototype quantities, respectively 

 7 a = specific weight of an individual armor unit, pcf 



* For convenience, symbols and abbreviations are listed in the Notation 

 (Appendix B) . 



